Swing saw with rectilinear motion



May 1, 1951 w. D. HUNT ETAL' 2,551,130

SWING SAW WITH RECTILINEAR MOTION Filed June 2, 1947 3 Sheets-Sheet 1Inventor;

Walter Duran Hunf Karl H. Woodbury M y l951 w. D. HUNT ETAL 2,551,130

SWING SAW WITH RECTILINEAR MOTION Filed June 2, 1947 v 5 Sheets-Sheet 29 9 Fi .1. 62 2/ 4 y l 5 4 C Inummzr Wa/fer Duran Hunf Kar/H. WoodburyB, WWW 8M8]:

y 1, 1951 w. D. HUN'T ETAL 2,551,130

SWING SAW WITH RECTILINEAR MOTION Filed June 2, 1947 3 Sheets-Sheet 3 H.2 2/ Q 62 g Fig. 5 4

//7 l I Y f v 36 I n ventor:

Walter Duran Hum Karl H. Woodbury H [I]! It/- 1 a Attorneys Patented May1, 1951 UNITED STATES TENT OFFICE SWING SAW WITH 'RE'CTILINEAR MOTIONWalter Duran Hunt and Karl H. Woodbury, Riverside, Calif.

Application Julie 2 1947, Serial N0. 751,848

3 Claims. E.

This invention relates to new and useful improvements and structuralrefinements in swing saws, and the principal objectof the invention isto provide a device of the character herein described, wherein the pointof contact of the saw with. the work reciprocates in a plane parallel tothe saw bed, whereby a uniform depth of cut is assured.

A further object of the invention is to provide the swing saw whichembodies in its constructi'onlinkage of novel design, so as tofacilitate performance of the operation above outlined.

Another object of the invention is to provide a swing saw which may beeasily adjusted as to height above the saw bed.

An additional object of the invention is to provide a swing saw which issimple in construc tion, which may be easily and convenientlymanipulated, and which will not readily become damaged.

A still further object of the invention is to provide a swing saw whichwill readily lend itself to economical manufacture and which is otherwise well adapted for the purpose for which it is intended.

With the above more important objects in View a and such other objectsas may become apparent as this specification proceeds, the inventionconsists essentially of the construction and arrangement of parts asshown in the accompanying drawings in which:

Figure 1 is a side elevation of the invention; Figure 2 is an end viewthereof, taken in the direction of the arrow 2 in Figure 1; Figure 3 isa cross-sectional view, taken substantially in the plane of the line 33in Figure 1;

Figure 4 is a cross-sectional view, takensub stantially in the plane ofthe line 4-4 in Fig-' ure 1; v

Figure 5 (Sheet 2) is a cross-sectional view, taken substantially in theplane of the line 5-5 in Figure 3; w

Figure 6 is a cross-sectional view, taken substantially in the plane ofthe line 66 in Figure 5;

Figure 7 (Sheet 3) is a cross-sectional View, taken substantially in theplane of the line l -=7 in Figure 1;

Figure 8 (Sheet 1) is a cross-sectional view illustrating. a modifiedform of the saw raising and lowering means which may be used in theinvention;

Figurefl isa fragmentary plan view, taken in the direction of the arrows9-4 in Figure l, and

Figure 10 (Sheet 3) is a cross-sectional detail, taken substantially inthe plane of the line Hi -10 in Figure 3.

Like characters of reference are used to designate like parts in thespecification and throughout the several views.

Referring now to the accompanying drawings in detail, the inventionconsists of a swing saw designated generally by the reference characterHi, the same embodying in its construction a sub stantially flat plateforming the saw, bed H, on which is mounted an upwardly extending,vertically adjustable standard l2.

This standard includes a lower portion con,- sisting of a cylindricalrod l3, andan upper nortion formed by a tubular extension [4. The rod I3is slidably telescopedto the lower end of the extension I 4 and asuitable set screw i5 is employed for releasably locking the two members(l3, Ht) together.

The extension 14- may be raised or lowered with respect to the rod l3 bymeans of a screw threaded shaft 16 which extends through the extension[4 and the lower end portion thereof is freely receivable in a bore ITprovided in the upper end portion of the rod l3. An internally threadedblock I8 is rigidly secured to the upper end portion of the rod, saidblock operatively engaging the rod 16-, as will be clearly apparent.

The rod I6 is prevented from longitudinal displacement by means of apair of collars l9 p'rovided on the rod and engaging the relativelyopposite surfaces of the cover plate 20 mounted at the upper end of theextension 14.

The upper end portion of the rod l6 provides what may be referred to asa crank which, in turn, is equipped with a suitable handle 2LAccordingly, it will be found that by simply rotat ing this crank handlethe extension M may be raised or lowered with respect tothe standard l3,whereupon, by tightening the set screw l5, the entire structure may belocked in any desired position.

It will be also noted that upon loosening the screw l5, the extension l4may be rotated with respect to the rod 13, so that the position of thesaw on the bed may be rotatably adjusted.

The upper end of the extension I4 is equipped with a pair of upwardlyprojecting brackets 23 which are secured to the extension in any desiredmanner, such as by welding,.or the like. A pivot pin 24 extendstransversely through the brackets 23 and a carrier beam 25 is mountedmedially of its length on this pin, as is best shown in Figure 1. Thebeam 25 is substantially U-shaped crosssectional configuration and theside members- 26 at one end portion of the beam are outwardly divergentso as to provide what may be called a yoke 21, best shown in theaccompanying Figure 2. The said yoke is adapted to receive the tubularextremity 26 by means of a suitable pin 30.

The configuration of the arm 29 is best illustrated in the accompanyingFigure 2, and it will be noted that the lower end portion of the armprovides a tubular bearing block 3| for a rotatable shaft 32, one end ofthe latter carrying a circnlar saw 33, while its remaining end isprovided with a relatively small pulley.

The pulley 34 is operatively connected by means of an endless belt 35 tothe relatively. large pulley 36 mounted on the armature shaft of theelectric motor 36 which, in turn, is secured intermediate the ends ofthe arm 29, as will be clearly apparent. If desired, the arm 29 may alsocarry a suitable guard 38 for the saw 33, and it will be noted that thearm is equipped with a convenient handle 39 whereby the arm, togetherwith the saw 33, may be oscillated in the direction of the arrows 40while the sawing operation is being performed.

However, it is to be understood that the oscillating movement of the arm29 is to be regarded as such only with respect to the arm 25, sincemeans are provided to assure that the axis of the shaft 32 reciprocatesin a straight plane, namely, that indicated by the line 4| in Figure 1.

In effect, the essence of novelty of the invention resides in theprovision of the particular means for achieving this requirement, saidmeans consisting of linkage which will be presently described.

This linkage includes a substantially horizontal limb 42 which ispivoted at one end thereof by means of a pin or screw 43 between a pairof blocks 44 (Figure 6-), the latter being rigidly secured to the lowerend portion of the aforementioned extension l4. The outer end or theremaining end of the limb 42 provides a fork 45 (Figure 4) which, inturn, is pivotally connected as at 45 to one end of an equalizer bar 41.

The remaining end of the arm 41 is pivoted as at 48 to a substantiallyU-shaped bracket 49, which, in turn, is adjustably secured to theunderside of the beam 25 by means of two screws 49' positioned in a pairof slots 25 (Figure 9) with which the beam is provided. A pair of links50 are also pivoted as at intermediate the ends of the limb 42, theremaining ends of the link 50 being pivoted as at 52 to one end of afurther link 53. The remaining end of the latter is pivoted as at 54 toa further U-shaped bracket 55 (similar to the aforementioned bracket 49)which is secured to the underside of the beam 25.

It will be noted that the pivotal connection between the links 50, 53,is straddled by a forked extremity 56 of a coupling rod 57, bestillustrated in Figure 3. The remaining forked extremity 58 of this rodstraddles the arm 29 and i5s9 pivotally connected thereto as isindicated at The use, it will be found that the action of the various:links, etc., is such that an oscillating motion imparted to the arm 29in the direction of the arrow 40 will be converted to a straight linereciprocating motion of the saw 33, that is to say, the axis of the sawshaft 32 will move in the straight plane indicated at 4| in Figure 1.Furthermore, it will be found that the plane 4| is parallel to thesurface of the saw bed so that when a board, or the like, indicated at63, is positioned on the bed, the cutting depth of the saw will beuniform and constant throughout the length of cut. I

Needless to say, the relative positioning of the pivot pins or screws43, 46, 48, 5|, 52, 54, 59, 30,. and 24, as well as the relativeposition of the shaft 32 should be such as to facilitate the maintenanceof uniform cutting, as above described, and a certain amount ofadjustment of the beam linkage will be facilitated by moving the bracket49, aswill be clearly understood.

Referring now to the modified embodiment of the invention illustrated inthe accompanying. Figure 8, the same pertains to the modified means forraising and lowerin the extension M with respect to the rod l3, themodified embodiment in-' cluding the saw bed 10 provided with a tubular,upwardly extending standard portion 1 I.

The tubular standard extension 12 is slidably received in the portion H,and a shaft 13, screwthreaded at the lower end portion thereof, ispositioned in the extension 12, as will be clearly apparent.

The screw threaded portion of the shaft 13- operatively engages aninternally threaded block 14 secured to the underside of the bed NJ, andit will be noted that by simply rotating the shaft 13, the extension 12may be raised or loweredwith respect to the standard portion 5|, as desired. It should, of course, be understood that the upperend of theshaft 13 is equipped withsuitable collars, similar to the aforementionedcollar I9, whereby the longitudinal displacement of the shaft withrespect to the extension- 52 is prevented.

Finally, the standard portion H may be formed with a longitudinallyextending, open-ended slot 75 and may be provided with a pair of ears 16at the edges of this slot, a suitable clamping member 11 being employedfor urging the two ears together. In this mannerjthe standard portion IImay be effectively tightened upon the extension 12, whereby the twoparts are effectively locked together, as is accomplished by the use ofthe set screw l5 in the embodiment previously described.

It is believed that the advantages and use of the invention will beclearly understood from the foregoing disclosure and accordingly,further de scription thereof at this point is deemed unnecessary.

While in the foregoing there has been shown and described the preferredembodiment of this invention it is to be understood that minor changesin the details of construction, combination and arrangement of parts maybe resorted to without departing from the spirit and scope, of theinvention as claimed.

What we claim as our invention is z 1. In a swing saw, the combinationof an upright standard, a carrier beam pivotally mounted at the upperend of said standard for raising and lowering movement,'an oscillatorysawsupporting arm pivoted to a free end portion of said beam andextending downwardly therefrom, and

means responsive to the oscillation of said arm for raising and loweringsaid beam whereby the lower end of the arm may reciprocate in asubstantially horizontal plane, said means comprising a verticallyswingable, substantially horizontal limb pivoted to an intermediateportion of said standard, a coupling rod pivoted at one end to anintermediate portion of said arm, a pair of links pivotally connected tothe remaining end 01- said rod, the free end of one link being pivotedto said beam, the free end of the remaining link being pivoted to saidlimb, and an equalizing bar having one end thereof pivoted to said limb,the remaining end of said bar being pivoted to said beam.

2. In a swing saw, the combination of an upright standard provided atits upper end with a horizontal fulcrum, a carrier beam having itsintermediate portion mounted on said fulcrum for raising and loweringmovement, an oscillatory arm pivoted to one free end of said beam andextending downwardly therefrom, a rotary saw mounted at the lower end ofsaid arm, and means responsive to oscillation of said arm for raisingand lowering said beam whereby the saw support ing end of the arm mayreciprocate in a substantially horizontal plane, said means comprising avertically swingable, substantially horizontal limb pivoted at one endthereof to an intermediate portion of said standard, a coupling rodpivoted at on end to an intermediate portion of 6 said arm, a pair oflinks pivoted at one end to the remaining end of said rod, the remainingend of one link being pivoted to said beam at a point between said armand said fulcrum, the remaining end of the second link being pivoted toa free end portion of said limb, and an equalizing bar pivoted at oneend thereof to the free end portion of said limb and having itsremaining end pivoted to said beam at a point adjacent said fulcrum.

3. The device as defined in claim 2 together with means for urging saidbeam to a raised position, said means including a counterweight providedon the remaining free end portion of the beam.

WALTER DURAN HUNT. KARL H. WOODBURY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,290,394 Vanderveld July 21,1942 2,302,356 Taylor Nov. 17, 1942 FOREIGN PATENTS Number Country Date219,584 Great Britain July 31, 1924

